The moment Hugh Grant verbally shoves his balls into this obnoxious Bush/Clinton expy's face always makes this Troper feel pride in his heart and to be proud of living in Europe. YMMV of course.
Hell, I think it's a CMOA and I'm an American. The Love Actually universe's President is a douchey combination of the worst of both Real Life Presidents (well, he doesn't come across as a Bush-level terrible speaker; he's more like a combo of Clinton, Bush, and Cheney.) Unfortunately the PM can no longer claim possession of either of David Beckam's feet, but the rest of the country's awesome stands.
The wedding scene in which the best man gives the bride and groom the best wedding present ever.
Ultimate CMoA from that film: Mark, Juliet, cue cards and fake carol singers. THAT is his CMoA.
Sam. Airport scene. That is all.
Olivia Olson's performance of "All I Want For Christmas Is You." Even better when you learn she actually had to tone down her singing skills so people wouldn't assume she was dubbed.
David's driver pulling out his operatic singing voice for Christmas carols.
This movie helped kick start an entire genre of film (Ensemble cast in a rom-com). How awesome is that?